Quote:
Originally Posted by bobcowan
Trapezium = a muscle in the upper back and shoulder.
Trapezoid = a geometric shape. 
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Bob - In the world outside of the USA it is a geometric shape... Just another example of the US bastardising the English language.
I've modified the design such that the top 50mm of the fixed pane/sheet would extend to the rear of the window opening. This should allow me to attach a guide the full length of the window and ensure a secure retention of the rear, trapezium shaped, sliding pane/sheet.